Gas or oil heating-stove



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GAS 0R OIL HEATING STOVB.v No. @64124. A ,Patengadlb/IaySl, 1887.

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A GAS OR'OIL HEATING STOVE.

No. 364,124. Patented May 31,` 1887.. l

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UNrTED 'STATESv NELsoN A. McoLAnY,

`OF SOUTH EVANSTON, ASSIGNOR TO THE CHICAGO GAS STOVE COMPANY, OF CHICAGO, ILLINOIS.

GAS .OR O'IL HEATING-STOVE.

SPECIFICATION forming part of Letters Patent No. 364,124, dated May 31, 18,237.v

' Application led December 28, 1385. Serial No. 156,872. (No model.)

`IJIcating-Stovcs, of which I do declare the following to bc a full, clear,andexactdescription, reference beinghad to the accompanying drawings, forming part of this specification.

My present invention has relation to the improvement of that class of gas or oil stovesin which the combustion of the gas or oil is effected within a closed chamber from which d the products of combustion are led away by a suitable eductionpipe, an'dwhich, by radiation, serve to impart heat to the air that surrounds it and that is passed through it by means of suitable tlues. In the construction of this kind of stove it has been heretofore proposed to divide the combust-ionchamber into two concentric compartments connected at their tops, so that the products of combust-ion would pass up the outer one and down the inner one, and to extend through the center of the inner chamber -an air-flue within which were placed a series of deflecting-plates, which caused the air, as it ascended, to take a sinuous course, in orderl to more thoroughly absorb the heat from the surface of the combustionchambcr.

The primary object of my present invention is to so improve the construction and arrangement ofthe combustion-chamber and of the air-heating fines that the products of .combustion, before passing into the eduction-pipe, will be robbed of all available heat.

A further object of my invention is to improve the construction of the stove in sundry details,hereinafter described; and these objects I have accomplished by the novel construction and arrangement of parts set forth in the sub- A designates the basc-plate of the stove, supported upon suitablefeet and provided, preferably, with the flange a, within which ts the lower edge of the outer cylinder or drum, B, which, together with the cylinder C, the baseplate A, and the top or cover D, constitutes the main combustion-chamber E of the stove.

In the bottom of the combustion-chamber is Y.

placed the circular perforated gas or oil pipe F, the ends of which project through the baseplate and are provided with a suitable stopcock, f, for controlling the supply of fuel. Concentric with the cylinder C, which closely adjoins the flange a of the basc-plate A and rcsts upon the reticulated arms a2 formed therebaseplate andisjoined to the flange c? of such plate. Upon the tops of the cylinders C'and G is fixed the cap H, in which are cast s uitable anged openings, 7;,-from which lead theI flaring discharge-pipes I, that connect with the flanged openings d in the cover D of the stove. The cylinders C and G and their cap H constitute theairheating chamber K, into the open bottom of which cool air enters, and from the top openings rof which it passes in heated condition.

Within the cylinder G, and encompassing the flanged opening'a* of the base-plate A, is placed the zigzag or sinuous air-heating flue L, the top portion, Z, of which is -of smallerdiameterv than the lower'part of the iiue and e11- compasses t-he flanged opening d of the cover D. The chamber M, which is formed by the cylinder G, the flue L, the cover D, and the bottom plate of the stove, communicates at its top with the main combustion-chamber E, and from the base of this chamber M leads the eduction-pipe m, through which the products of combustion will be discharged.

Near the bottom of the outer cylinder, B, a number of openings, b, will be formed for the admission of air to support combustion, and the amount of air admitted through these openin'gs will be controlled by means of the registerwith, is placed the cylinder G,the lower edge `ofwhich also rests upon the arms a2 of the valves b', that cover the same. In the cylinder B, labout the position shown, will be formed an opening, through which the fire may be lighted, this opening being closed preferably by means of an isnglass door, which permits the inspee tion of the flame.

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`ward through the flue.

air.

From the foregoing construction the operation will be seen to be as follows: The fuel, consisting of mixed gas and air, will be admitted to the pipe F in proper quantity,deter mined by the stop-cock f, and the valves b will be opened such distance as to admit a proportionate quantity of air sufticient to support a proper combustion of the fuel. By means of these register-valves b, I am enabled to admit the exact quantity, of air necessary to support perfect combustion, whatever may be the amount of mixed gas and air or oil that is being burned at the pipe F. The tire being now started at the base of the chamber E, the products of combustion will pass upward through chamber E and downward through the chamber M until they escape through the eduction-pipe m. At the same time air will pass upward through the intermediate airchamber, K, and will escape thence through the pipes I at its top, and air will also passin sinuous course upward through the zigzag flue L. By contracting the upper portion of the air-due L, and by making the dischargeopenings of the chamber K of less area than the induction end of said chamber, I am enabled to so impede the flow of the air that it will become thoroughly heated before leaving the stove. This is a decided advantage, for were the air chamber or flue L oflike dialneter throughout, the air would ascend with too great rapidity to insure its becoming thor- -ou'ghly heated. By forming the pipes I flaring at their topsand somewhat flattened at their bottoms, I am enabled also to obtain a larger surface exposure to the heated products of combustion than would be possible were the pipes of small and uniform diameter. By placing the air chamber K between vthem in combustionehamber E and the chamber M, a very large heated surface is exposed to the air, and by forming the central air-flue, L, of sinuous or zigzag shape the products of combustion and highly-heated air inthe chamber M will be forced to impart their heat to the large surface area of the tlue L, which will in turn communicate it to the air passing up- By this means the entire available heat of the fuel will be absorbed by the air before the products of combustion pass from the stove.

In Figs. 3 'and 4 of the drawings I have shown the base-plate A of the stove as provided with a dependent flange, a, on which is removably titted the hood I), that is furnished with a suitable induction-pipe, 19, from which 'leads the tube or flue p to the'outer This hood can be readily attached to or removed from the stove, and when in position will insure the delivery to the air-flues K and Mo'fthe Vstove a continuous supply of pure air. A

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a gas 'or voil stove, the combination of a bottom plate, a cover, an outer cylinder or casing, B, land an inner cylinder creasing, C, forming the main primary combustionchamber E, the gas or oil pipe F, located within and around the bottom of said combustionehamber, the cylinder or casing G, separated from the cylinder or casing C to form an airheating chamber, K, open at its top andy bottom, an open-ended air-heating flue within said casing G and separated therefrom to form an 'inner combustion-chamber, M, closed at its bottom, fines or passages for the products of combustion, uniting the'chambers E and M at their tops, and a suitable exit-flue leading from the bottom of the inner combustionchamber, M, substantially as described.

2. In a gas or oil stove, the combination of a cylinder or casing, B, and a cylinder or casing, C, forming the main combustion-chamber E, the gas or oil pipe-F, located within and around the bottom of said combustion-chamber, the cylinder or casing G, separated from the cylinder or casing C to form the air-heating chamber K ,open at its top and bottom, the perforated top plate, II,above said air-heating chamber, the perforated cover D, short pipes between said plate H and cover D, an opencasing G and separated therefrom to form an inner col'nbustion-chamber, M, closed at its bottom, tiues or passages-between the top plate, H, and cover D for uniting the main combustion-chamber E, an inner combustion-chainber, M, and' an exit-flue leading from said combustion-chamber M, substantially as described.

3. In a gas or oil heatingstovc, the combination ot' a bottom plate, a cover, an outer cylinder or casing, B, and a cylinder or casing, C, forming the main combustion-chamberE, a gas or oilpipe, F, located within and around the bottom of the said combustion-chamber, a cylinder or casing. G, separated from the cylinder or casing C to form the air heating chamberK, open at top and bottom, a zigzag open-ended air-heating flue within said cylinder or easing G and separated therefrom to form an linner combustion-chamber, M, closed at its bottom, dues or passages for the products of combustion', uniting the chambers E and M atV their tops, and an exit-flue leading from the lower part of the inner combustionchamber, M, substantially as described.

4. In a gas or oil stove, the combination of walls Vorrcasings forming an outer combustionchamber, E, walls or casings forming the chamber M, flueways or passages connecting said chambers, the casings ofsaid chambers E and M being separated from each other to form an intermediate air-heating chamber, K, an air pipe or flue, L, located within the chamber M, and a fresh-air hood communicating with the chamber K and with the'pipe or flue L,substa'n tially as described.

n NELSON A. MCCLARY.

Witnesses:

GEO.. I. FISHER, Jr., IDA BCARPENTER.

ended air-heating flue within said cylinder or 

